87Rb/87Sr study of diogenites |
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| Authors: | J.L. Birck C.J. Allègre |
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| Affiliation: | 1. Laboratoire de Géochimie et Cosmochimie, Institut de Physique du Globe, Université Pierre et Marie Curie, 75230 Paris Cedex 05 France;2. Département des Sciences de la Terre, Universitéde Paris 7, C.N.R.S. LA 196, 4 Place Jussieu, 75230 Paris Cedex 05 France |
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| Abstract: | The five diogenites, Johnstown, Roda, Ellemeet, Shalka and Tatahouine, give scattered data in the87Rb/86Sr,87Sr/86Sr diagram. This can result from a disturbance which occurred later than 4.45 Ga ago. However, it is shown that if samples of sufficient size were analyzed, there meteorites could plot on the eucrite isochron and are thereby in agreement with a genetic relation between eucrites, howardites and diogenites. The age of eucrite differentiation from diogenites has been computed using data from the two families yielding an age of 4.47±0.1Ga(2σ) (λ=1.42×10?11a?1), the initial87Sr/86Sr ratio being BABI. |
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